论文部分内容阅读
首先通过红外光谱(IR)、核磁共振(1 H-NMR)和凝胶渗透色谱(GPC)对所选用的杜仲胶(EUG)和合成反式-1,4-聚异戊二烯(TPI)进行了微观结构分析,进而采用差示扫描量热法(DSC)和偏光显微镜(POM)对EUG和TPI的等温结晶行为进行了对比研究,重点讨论了二者链化学组成和微观结构的不同对二者等温结晶行为的影响。Avrami方程分析DSC数据结果及POM观察结果显示,EUG和TPI的成核方式和生长机理各不相同。EUG主要为均相成核,而TPI则为异相成核。EUG的等温结晶行为对温度有着更高的敏感性。EUG的结晶活化能(147.2kJ/mol)大于TPI的(114.8kJ/mol)。在37℃下熔体等温结晶,EUG所得主要为β球晶,而TPI为α和β两种球晶并存,且TPI中引发剂残渣等灰分的异相成核作用导致很早就发生了球晶间的相互碰撞。
The Eucommia ulmoides gum (EUG) and the synthetic trans-1,4-polyisoprene (TPI) were selected by infrared spectroscopy (IR), nuclear magnetic resonance (NMR) and gel permeation chromatography (GPC) The microstructure analysis was carried out. The isothermal crystallization behaviors of EUG and TPI were compared by differential scanning calorimetry (DSC) and polarized light microscopy (POM), and the different pairs of chemical composition and microstructure of the two chains were discussed The two areothermal crystallization behavior. Avrami equation analysis DSC data results and POM observations showed that EUG and TPI nucleation and growth mechanisms vary. EUG is mainly homogeneous nucleation, while TPI is heterogeneous nucleation. The isothermal crystallization behavior of EUG is more sensitive to temperature. The activation energy of crystallization of EUG (147.2kJ / mol) is larger than that of TPI (114.8kJ / mol). Melt isothermal crystallization at 37 ℃, EUG obtained mainly β-spherulites, and TPI α and β both spherulites co-exist, and TPI heterogeneous nucleation of ash such as initiator residue led to the very early ball Interactions between the crystal.